Effect of lithium-based glass addition on the microwave dielectric properties of Ca[(Li1/3Nb2/3)1−xTix]O3−δ ceramics for LTCC applications

A new temperature stable microwave dielectric with low-firing temperature in Bi2MoO6–TiO2 system

“…Recently, a number of material researchers have focused their research on lowering the sintering temperatures of microwave dielectric ceramics to meet the LTCC requirements. Three approaches are usually used to develop low-firing microwave dielectric ceramics: (a) addition of oxides or glass with low melting temperature [4][5][6][7][8][9][10][11], such as V 2 O 5 , CuO, LiF, and B 2 O 3 ; (b) utilization of ultra-fine particles for raw materials [12,13]; (c) development of novel glass-free low-firing dielectric ceramics, including Bi 2 O 3 -TeO 2 , TiO 2 -TeO 2 , CaO-TeO 2 , BaO-TeO 2 , ZnO-TeO 2 binary systems, BaO-TiO 2 -TeO 2 ternary system, and Bi 2 W 2 O 9 systems [14][15][16][17][18][19][20][21]. Our recent research [22] showed that Bi 2 O 3 -MoO 3 binary system is a new ultra-low-firing microwave dielectric material.…”

Microwave dielectric properties and low temperature sintering behavior of Li2CoTi3O8 ceramic

“…For application to resonators, microwave dielectric materials require a high relative permittivity (ε r ) to facilitate circuit miniaturization, a high quality factor values (Q × f) to increase their selectivity, and a near-zero temperature coefficient of the resonant frequency ( f ) to ensure the stability of the frequency against temperature changes [1]. Although some materials with excellent properties have been developed for commercial applications, such as Ba(Mg 1/3 Ta 2/3 )O 3 , (Zr,Sn)TiO 4 , and CaTiO 3 -NdAlO 3 [1], active work is still being carried out in search of sophisticated materials to perform the same or an improved function [2][3][4][5][6][7].…”

“…Recently, there is a considerable interest in lowering the sintering temperatures of dielectric ceramics for co-firing with cheaper and highly conductive internal electrode metals such as Ag (the melting point 961 • C) and Cu (the melting point 1050 • C) [7,8], however, the sintering temperatures of most of commercial microwave dielectric ceramics are usually above 1300 • C. In order to reduce the sintering temperature of dielectric ceramics, there are several methods commonly explored [9]: (1) the addition of low melting point compounds or glass-forming additives to reduce the sintering temperature of commercially developed dielectric ceramics, however, in many cases, the additions produce a significant deterioration in Q × f values, (2) the chemical processing and smaller particle size of starting materials by the sol-gel and coprecipitation methods, and (3) a study of new series of dielectric ceramics with low sintering temperature such as BiNbO 4 , TiO 2 -TeO 2 , and ZnTiO 3 [1,9]. Recently, many studies have been focused on Li-containing compounds which have low sintering temperature and excellent microwave dielectric properties, such as Li 1+x−y Nb 1−3x−3y Ti x+4y O 3 (x = 0.1, y = 0.05-0.175) ceramics [10][11][12], Li 3 [16].…”

Preparation and properties of CaO–SiO2–B2O3 glass-ceramic at low temperature

“…were prepared by fast firing approach; lead zirconate titanate ceramics [9] and PZT [10] ceramics were prepared by fast firing approach at low temperature. One example of low-temperature sintering is low-temperature co-fired ceramic (LTCC) which is one branch in the ceramics field, due to its many advantages in preparing three-dimensional multilayer structures [11,12] and there are many reports about LTCC [13][14][15].…”